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fix: support PDF previews in WebKit - #234
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Why
PDF previews call
Map.prototype.getOrInsertComputed, which WebKit does not implement. As a result, both embedded knowledge-page PDFs and asset previews fail to render on iOS.How
Configure Vite to resolve PDF.js to its legacy distribution and copy the matching legacy worker. The legacy build supplies the missing compatibility polyfill, while keeping the main thread and worker on the same PDF.js version.